package com.wuji1626.spark.rdd.transform

import org.apache.spark.rdd.RDD
import org.apache.spark.{SparkConf, SparkContext}

object RDD_Transform_flatMap {

  def main(args: Array[String]): Unit = {
    // Step1: 准备环境
    val sparkConf = new SparkConf().setMaster("local[*]").setAppName("Operator")
    val sc = new SparkContext(sparkConf)


    // Step2: 算子 map
    val rdd: RDD[List[Int]] = sc.makeRDD(List(
      List(1, 2), List(3, 4)
    ))

    val flatMapRDD: RDD[Int] = rdd.flatMap(
      list => {
        list
      }
    )

    flatMapRDD.collect().foreach(println)

    // Step3: 关闭环境
    sc.stop()
  }

}
